some of the simple python programs | GreatToCode

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python program to print hello world !

print ('Hello ,World '!)

In this program we have used the built in print () function to print the string Hello, World ! on our screen .

by the way string is the way to sequence of the character . In python string are enclosed  inside the single quote, double quote or triple quote .

python program to add two numbers ! 

we will use the + operator to add two numbers .

Example 1. Add Two numbers 

#This program add two numbers 

num1= 2

num2 =3 

#add two numbers 

sum = num1 +  num2 

#Display the sum 

print ( 'The sum of the {0} and {1} is {2} '   .format (num1, num2 , sum ) )

Example 2. Add two numbers with the user Input 

#store input numbers 

num1 = input (' Enter first number: ')

num2 = input (' Enter second number: ')

 # Add two numbers 

Sum= float (num1)  + float (num2)

#display the sum 

print('The sum OF THE {0} and {1} is {2}' .format(num1 , num2 , sum ) )

output 

Enter first number: 2

Enter second number 3

The sum of the 2 and 3 is 5 

In this program we asked the user to Enter two numbers and this program display the sum of the two numbers entered by the users . 

We Use Built -in function input () to take the input . since input () returns a string , We convert the string into number using the float () function . then the number are added .

here is alternative of the above -

print('The sum is %.1f' %(float(input('Enter first number: ')) + float(input('Enter second number: '))))

print('The sum is %.If %(float(input('Enter first number:'))+ float(input('Enter second number:'))))

Output 

Enter the first number: 4

Enter the second number: 6 

the sum of 4 and 6 is 10 .

Although the program uses no variables ( memory efficient ) it is harder to read.

PYTHON PROGRAM TO FIND THE SQUARE ROOT

Example : for positive numbers 

#python program to calculate the square root 

#Note: change this value for the different results .

num=6

#To take the input from the user

#num = float (input ('Enter a number: ') )

num_sqrt =num **  0.5 

print ('The square root of % 0.3f  is % 0.3f' % (num , num_sqrt )) 

output 

The square root of the 6.000 is  2.828 

In this program we store the number in num  and find the square root using the ** exponent operator .

this program work on the all the positive real numbers .